Don't be angry at me, but there is about a 100% chance I will word this funky as hell.

What is the easiest way to play sound effects, samples, or whatever during live shows? I know there are multiple ways to do it but I'm not sure what the cheapest and easiest way to do it.

My next question is regarding wireless microphones. I'm in a metal band and I'm wondering what would be my best option? I'm looking around the $400 range.

No idea with regards to sound effects other than a Korg Khaos Pad, and with regards to wireless mics, Sennheiser/Bose both do solid stuff, and there are cheaper brands well below your budget

What brand would you recommend the most? I don't need to the top of the line but I don't want cheap stuff either. Ill look into the those brands you posted also.

Sennheiser are the shiznit of Mics, so i'd name them as my recommendation.

Khaos pad will need some work - I havn't got a clue how to use one, but i'm sure that a music store could give you a crash course

I'll look for into the sound effects shit. Thanks for the help on the mics though.